Dipper for shoveling machines



A. K. MITCHELL. DIFFER FOR sHovELING MACHINES.

APPLICATION FILED JULY 21,1920.

y Patented'June 6, 1922.

ortis.

ARTI-IUE K. MITCHELL, OF BRONXVILLE, YORK, ASSIGNOR TO ST. JOSEPH LEAD COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

DIPPER FOR SHOVELING MACHINES.

Specification of Letters Patent. Eaten-ted June 6, 1922 Application filed July 21, 1920. 'Serial No. 397,882.

To all whom it may conce/rn:

Be it known that I, ARTHUR K.`M1TCHELL, a citizen of the United States, and resident of BronXvillc, county of Westchester and State of New York, have invented certain new and useful Improvements in Dippers for Shovel.- ing Machines, of which the following is a description.

This invention relates to dippers for shoveling machines, and has for its primary object to provide a dipper construction primarily designed for use in connection with shoveling machines to be used in underground mining, and wherein .the dipper is filled with the material by imparting a forward longitudinal thrust to the dipper at or near the ground level. n

More particularly, the present invention comprehends a dipper of the above type embodying a section fixed to the boom of the machine, and a swinging section mounted on the boom, said dipper sections being so constructed that when the boom is elevated and the dipper is opened to discharge the material, no part of the swinging dipper section will project above the longitudinal plane of the boom. This fact makes it possible to operate themachine in a comparatively confined space where the dipper might otherwise be obstructed in its opening movement by the roof of the mine room or location.

It is also an important object of the invention to provide a dipper having its sections so constructed and mounted upon the boom that when the swinging section is in open position a maximum clearance space will be afforded above the car or other vehicle into which the material is dumped, thus permitting the use ofa relatively deep car or vehicle in mines where the permissibleY vertical height for the swinging of the boom to elevate the dipper is comparatively limited.

In one embodiment of the invention', I propose to construct the dipper sections so that when in closedv position their meeting edges will delin'e a bisecting diagonal line extending radially from the pivotof the swinging dipper section. In another embodiment, the fixed section of the dipper constitutes merely the rear wall thereof, which wall is suitably braced from the boom, and in both embodiments of the invention, the fixed dipper section may directly sustain the longitudinal pressure from the swinging dipper section in the forward thrust movement of the dipper.

ments of the invention, and inwhich similarv reference characters designate corresponding parts throughout the severalxviews,

Figure 1 is a top plan view of the end of the boom of a shoveling machine, having my improved dipper mounted thereon;

Figure 2 is a side elevation showing the dipper in full lines in its closed position, and in dotted lines in an elevated open position; and

Figure 3 is a view similar to Figure 2, illustrating a slightly modified form of the dipper. I

Referring in detail to the drawing, and more particularly to Figures l and 2 thereof,

5 designates the side beams of a boom which is similar in construction to the boom shown in my application for a patent on Undervground Mining Machine, Serial No. 397,881, filed of even date herewith. rI`he forward ends of the side bea-ms 5 converge inwardly towards each other, and in the bracket elements 6, fixed to the extremities of these beams, the ends of a transverse rod 7 are mounted. I

The lfixed dipper section 8 is suitably se'- cured to the under side of the boom and eX- tends downwardly therefrom, said dipper section having side walls of triangular form, the lower edges 9 of which are obliquely inclined upwardly from the lower edge of the rear wall of said dipper section in radial relation to therod 7.

The other dipper section 10 is. loosely suspended. from the rod 7 for swinging movement at the apeXes of its side walls which are likewise of triangular shape. The inclined edges l1 of these side walls of the swinging dipper section are also radially disposed with relation to the rod 7 and are adapted to shut roo against the edges 9 of the fixed dipper section 8 when the flipper is closed, as seen in full lines'in `Figure 2 of the drawings, The dipper section 10 is equipped with the usual spaced teeth 12 projecting in advance of thekmeans for this purpose l have fully disclosed in my co-pending application above referred to.

ln the operation of the device as shown in Figures 1 and 2, the boom is disposed in its lowered position withfthe dipper sections closed, and the dipper resting upon the floor of the mine; A suitable latch 16 is provided for holding the clipper sectiony 10 in its closed position.` The boom is now movedlongitudinally to impart a forward thrust to the dipper in a horizontal plane, so that the dipper teeth 12 will enter beneath the mass of material which willv be collected within the clipper. The hoisting mechanism is now operated to swing the boom upwardly to the dotted .linepositiom seen in Figure 2. TheA latch 16 is then tripped and the dipper section 10 will immediately swingto its open position by the pressure of the load thereon and the material will then drop downwardly between the two dipper sections and into the car or transporting vehicle over which the flipper is positioned. It will be noted that when the sectionlO of the dipper is in its open position, the dipper teeth 12 do not extend above the longitudinally extended plane of the boom. Therefore, the dipper may freely open in a relatively confined space such as may be the case in mining operations, and such opening movement will not be prevented or limited by the dipper teeth encountering the beams or the wall of the roof. 4lt will further be seen that when theswinging dipper section is in open position, it extends only for a very short distance below the lower edge of the fixed dipper section. yllhus a maximum clearance space will be afforded above the car or vehicle into which the material is dumped and permit of the use of a comparatively deep car without interfering with the swinging movement of the boom. Also it is to be observed that when the dipper is closed, the dipper section 10 projects only for a comparatively short distance in advance of the boom. so that the boom may be swung horizontally without danger of the dipper encountering the vertical supporting pillars in the mine.

In. Figure' 8 of the drawing, I' have disclosed aslightly modified form of the invention, wherein the. fixed.y section 8. of the dipper is not providedr with the triangular side walls, but constitutes merely the rear Wall of the dipper.. Thisfixed clipper section. is braced by means of obliquely disposed struts 15 which are riveted tothe lower edge of said clipper section at their forward ends and to one of the transverse beams of the boom at their rear ends. Of course, this manner of bracing the fixed dipper section is merelyA suggestive, since it is obvious that various other ways of bracing the dipper section might be adopted. In this case, the movable dipper section 10 which is mounted for swinging movement upon the end of the boom inthe manner abovek described', has its side walls extending the full depth of the clipper throughout the length thereof and their rear edges 11 abutting against the dipper section 8 when the clipper is closed". The upper edges of the side walls of the Clipper section 10 contact* with the under side of the boom. Thus, in this construction, it lwill be seen that inthe forward thrust of the clipper to fill the same, the longitudinal rearward pressure may all or partly devolve upon the fixed section 8" as in the 'embodiment of the invention first described. In the operation of this modifiedi form of the dipper, when the dipper is open, as seen in the dotted lines in Figure 3, the movable section assumes approximately the same lposition with relation to the boomy as in the.

construction first described, and the dipper teeth do not project above the plane ofthe boom.

' From the foregoing description, consid-v ered in connection with the accompanying drawing, the construction, manner of operation and the several advantages of'v the illustrated embodiments of the invention, will be fully understood. It will be seen that l have devised a dipper for shoveling machines, which is admirably adapted for use. in connection with such machines to be operated in'mines and other comparatively confined spaces, the dipper section beingy so mounted and arranged with respect to the boom that .the decrease'in vertical clearance above the car or vehicle, due to the opening of the dipper is reduced to a minimum. Thus, in the relatively short swinging movement of the dipper section to open position it wilL project downwardly below the fixed dipperl section for only a short distance. However, this opening movementisl amply sufficient to `insure the quick' andi complete discharge of the contents ofthe dipper. In practice, the dipper may be rmade of anydesired` capacity in accordance with the particular purpose for which the shoveling machine is to be employed, and, while I have herein referred to. this improved dipper as primarily designed for use in connection with mining machines, it will, of course, be manifest that the invention can be advantageously employed for various other` purposes. Further, although I have described and illustrated several desirable embodiments of the improved dipper, it may also be exemplified in numerous other alternative structural forms, and I accordingly reserve the privilege of adopting all such legitimate changes in the form, construction and relative arrangement of the several parts, as may be fairly embodied within the spirit and scope of the invention as claimed.

I claim:

l. A dipper for shoveling machines, comprising,- in combination with a boom, a dipper section fixed to the boom, and a movable discharge section mounted upon the end of the boom and comprising parts arranged to constitute side portions of the dipper when in closed position, said dipper sections, when closed, being disposed below the plane of the boom.

2. A dipper for shovelingmachines, comprising, in combination with a boom, a dipper section iixed to the boom, and a movable discharge section mounted upon the end of the boom and comprising parts arrangedl to constitute side portions of the dipper when in closed position, said latter dipper section being inclined downwardly from the plane of the boom to an extent as large as the angular movement of said discharge section between closed and open positions so that when in its open position, no part of the dipper will proj ect above the projected plane of the boom.

3. A dipper for shoveling machines, comprising in combination with a boom, a Vdipper section fixed to the boom and depending therefrom, and a swinging dipper section mounted upon the end of the boom, said section being formed with a bottom wall arranged substantially parallel to the plane of the boom in the closed position of the dipper section and being open at its .front end to adapt the dipper to be filled by a horizontal thrust movement and having side walls abutting against the walls of the fixed dipper section to transmit the longitudinal closed and open positions so that when in open position no part of said dipper section will project above the projected plane of the boom.

4. A dipper 'for shoveling machines, comprising, in combination with a boom, fixed and movable dipper sections mounted upon the boom, and depending therefrom, the major portion of the dipper when in closed position extending rearwardly from the boom end and said movable dipper section being formedy with an open end inclined downwardly from the plane of the boom to an extent as large as the angular movement of the movable dipper section between closed and open positions so that when in open position no part thereof will project above the projected plane of the boom.

5. A dipper for shoveling machines, comprising, in combination with a boom, a fixed dipper section and a swinging dipper section having a wall adapted to form the bottom of the dipper when such sections are in closed position, and having its front end inclined downwardly from the plane of the boom to an extent as large as the angular movement of the swinging dipper section between closed and open positions, and the rear edge of said wall being movable upon the opening of the dipper sections, when the boom is in discharge position, to a position adjacent to the vertical plane of the point of attachment of the movable dipper section to the boom, so that the reduction in clearance space above the transporting car or vehicle when the swinging dippersection moves to its open position will be reduced to a minimum.

In testimony that I claim the foregoing as my invention, I have signed my name hereunder.

ARTHUR K. MITCHELL. 

